/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.facebook.presto.decoder.avro;

import com.facebook.presto.decoder.DecoderColumnHandle;
import com.facebook.presto.decoder.RowDecoder;
import com.facebook.presto.decoder.RowDecoderFactory;
import org.apache.avro.Schema;
import org.apache.avro.generic.GenericDatumReader;

import java.util.Map;
import java.util.Set;

import static java.util.Objects.requireNonNull;

public class AvroRowDecoderFactory
        implements RowDecoderFactory
{
    @Override
    public RowDecoder create(Map<String, String> decoderParams, Set<DecoderColumnHandle> columns)
    {
        String dataSchema = requireNonNull(decoderParams.get("dataSchema"), "dataSchema cannot be null");
        Schema parsedSchema = (new Schema.Parser()).parse(dataSchema);
        return new AvroRowDecoder(new GenericDatumReader<>(parsedSchema), columns);
    }
}
